glActiveTexture — select active texture unit
void glActiveTexture( | GLenum | texture) ; |
texture
Specifies which texture unit to make active. The number
of texture units is implementation dependent, but must be at least
two. texture
must be one of
GL_TEXTURE
GL_MAX_TEXTURE_COORDS
- 1)
and (GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS
- 1).
The initial value is GL_TEXTURE0
.
glActiveTexture
selects which texture unit subsequent texture state calls will
affect. The number of texture units an implementation supports is
implementation dependent, but must be at least 2.
Vertex arrays are client-side GL resources, which are selected by the glClientActiveTexture routine.
glActiveTexture
is only supported if the GL version is 1.3 or greater, or if
ARB_multitexture
is included in the string returned by
glGetString when called with the argument GL_EXTENSIONS
.
GL_INVALID_ENUM
is generated if texture
is not one of
GL_TEXTURE
GL_MAX_TEXTURE_COORDS
- 1)
and (GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS
- 1).
glGet with argument GL_ACTIVE_TEXTURE
, GL_MAX_TEXTURE_COORDS
, or GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS
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